Compressed-air starting device of internal-combustion engines



I June 149 A. U. s. DANIELSSON COMPRESSED AIR STARTING DEVICE OFINTERNAL COMBUSTION ENGINES Filed Feb. 5, '1925 A. (7-5. Ogk/az:

* 7 Apgps.

i the top oi the engine.

Patented June 14, 1927.

2 UNITED STATES PAT AXELIUNO STURE DANIELSSON, or ULISUNDA, swnnnn,ASSIGNOR TO AKTIEIBOLAGET ATLAS DIESEL, or STOCKHOLM, SWEDEN, ACORPORATION or WE s comrnnssnn-Amsranrme imvrcn orm'rnnnaL-comsusrronmvenvns:

Applicationflled ,l ebruary 5, 1923,.Serla1No. 617,043, andin Sweden.February 2, 1922 I This invention relates to an, arrangement iniinternalcombustion, engines started by means oi compressed air, owing to whichthe valve admiring the compressed air may be shifted by the same cam,which actuatesthe fuel pump or any other member causing the introducingoff the fuel into the Working cylindeia, ,The invention is applicableespecial to internal combustion engines of that type, in which the fuelpump is located nea r the combustion. chamber of the working cylinderand is actuated bya cam, prov ded on the crank shaft, and by meansv of alink extending upwards from thesaid shaft to In engines of the said typethe n'iovement Of the starting valve may be derived tor instance fromthe said link.

Big. 1 of the accompanying drawing shows diagrannnatically a startingdevice arranged in accordance with this invention and adapted to anengine of the type just stated. Fig.

'2 shows a diagram.

1 is the crank shaft of the engine, and 2 is and bv n'ieans of a bellcrank lever 4, pivoted at 3, and a link 5 actuates a bell crank lever(3,. pivoted at 24 connect-ed with the plunger or piston 25 ot the fuelpump of the engine. The said plunger 25 sucks the fucl'from thereceptacle through a channel 26 provided with a non-return valve (notshown) and forces the same into the working cylinder 27 through channel28 in the well known manner. t is the admission valve of the compressedair, etlccting communication between a COY1(l.illlI 8, extending forinstance from an accuniiulator, charged by the engine itself or in anyother manner, and an inlet 9 to the working cylinder oi the engine. Tothe valve spindle a lever arm 11 is connected, which is pivoteo at andby a divided link 12, 1.8 is connected with a bell crank lever 14, 15,swingable on an eccentric pin 16. By rotating the said pin 16 by meansof a handle 16*, the bell crank lever 14, may be raised to such a level,that its arm 15 is actuated by an adjustable abutment, provided on thelink 5 and consisting for instance oif a nut 1'7 with lock nut 18 inscrewthreaded engagement with the link 5. Between the parts 12 and 13 ofthe divided link a spring 19 is provided, bearing against the bottomwall of a sleeve 20, connected with the part 12, and a flange 21provided on the part1 3. The spindle of the valve 7 .is acted upon by aspring 22, .tending to'close the valve, and thevalve may be locked inclosed position, by means of a screw 23, serving as an abutment for thevalve spindle and pro! vided with a lock nut 24. J

During the operation of the engine the valve 7 is held in closedpositionby the screw 23 as shownin the drawing. The bell crank lever 14, 15 hasbeen lowered to such a level, that its arm 15 is not acted upon by theabutment 17. For thejstarting of the engine the valve? is the screw 23outwards, and the bell crank lever 14, 15 raised by rotating the eccen:trio pin 16, so that the arm 15 may be ac tuated by the abutment 17 Thecrank shaft 1 is rotated through such an angle, that the ENT OFFICE.

released, by turning piston or the working cylinder has passed for ashort distance the starting point of its expansion stroke. The cam 2then actuates the bell crank lever 4, which b means of the link 5,abutment 17 bell cranli lever 14, 15, link 12, 13 and lever arm 11 opensthe valve 7, so that compressed air is forced into the working cylinder27 and drives the engine. Consequently, the engine operates as an airengine. After the starting of the engine the valve 7 is again locked inclosed position and the bell crank lever 14, 15 is brought into'such aposition, that it is not acted upon by the abutment 17. The opening ofthe valve 7 is controlled by adjusting the position of the abutmentl'?relatively to the bell crank lever l4, 15. The valve 7 ought to beopened comparatively uickly b the cam 2, for instance during tie partcliesignated by ab in the diagram, Fig. 2, illustrating the movement ofthe link 5 moved upwards and downwards at constant velocity by the cam2. The valve is then held in open position during the part bcd and isclosed comparatively quickly during the part cZ-e. The object 01": thespring 19 is to render possible the opening of the valve in the statedmanner without any one of the parts transmitting the movement to thevalve being damaged. The tension of the spring 19 is so great, that thespring is able to overcome theressure of the spring 22 and the aircontained in the' accumulator. As the valve has been opened and thevalve spindle bears against the screw 23, the spring 22 is compressedduring the part b-cot the diagram and will then expand during the part-cl. The object of the spring 19 is also to prevent the breaking of themotion transmitting members, if-

the operator, at the starting of the engine neglects to release thevalve 7 by turning the screw 23 outwards.

The motion necessary for shifting the valve 7 may, evidently, be derivedfrom any one of the members Which contribute to move the fuel plunger.In any case a simple device is gained: for the controlling ofthepressure air valve bymeans of the same cam Which actuates the fuelpump.

The invention may, evidently, be moditied in many respects Without exeeding the limits of the same.

I claim. 7

1. In an internal combustion engine adapted to be started by means-ofcompressed gas the combination-of a starting valve, a pump feeding fuelinto the combustion chamber of the working cylinder of the engine,driving means for the said pump including a reciprocating member, anabutment provided on the said member, a movable member coupled to thestarting valve, and means for bringing the said movable member into thepath of said abutment and out of the same.

2. In an internal' combustion engine adapted to-be started by, means ofcompressed gas, the combination of a starting valve, a pump feeding fuelinto the combustion chamber of the WOIkll'l" cylinder of the engine, anengine rotatable cam, pump operating mechanism between the cam and thepump and including a vertically disposed connecting rod, an abutment onthe rod, starting valve operating mechanism, and manually operable meansin connection with the starting valve operating mechanism for moving apart of said mechanism into and out of the path 01 movement of theabutment for controlling the operation of the starting valve.

In testimony whereof, I have signed my name to this specification.

AXEL UNO STURE DANIELSSON.

